Evidence supporting the use of: Vitamin D (cholecalciferol)
For the health condition: Hair (loss or thinning)

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Synopsis

Source of validity: Scientific
Rating (out of 5): 2

Vitamin D (cholecalciferol) has some scientific basis for its use in supporting hair growth and addressing hair loss, though the evidence is limited and not robust. Several observational studies have found that individuals with certain types of hair loss, particularly alopecia areata and telogen effluvium, often have lower serum vitamin D levels compared to controls. Additionally, vitamin D receptors are present in hair follicles, and animal studies suggest that vitamin D signaling is important for the normal hair follicle cycle. Rare genetic disorders causing vitamin D receptor defects are associated with hair loss, further supporting a biological role.

Despite these associations, interventional studies in humans are scarce and results are mixed. Some small studies and case reports have suggested that vitamin D supplementation may help hair regrowth in people with deficiency, but randomized controlled trials are lacking, and no clear guidelines exist for using vitamin D as a treatment for hair loss in the general population. Most experts agree that correcting vitamin D deficiency is reasonable as part of a comprehensive approach, but there is insufficient evidence to recommend high-dose supplementation specifically for hair loss in people with normal vitamin D levels.

In summary, while there is some scientific rationale and early evidence linking vitamin D to hair health, the overall quality and quantity of evidence supporting its use as a treatment for hair loss is limited, meriting a rating of 2 out of 5.

More about Vitamin D (cholecalciferol)
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